The rational for not drinking with meals is that the liquid washes the food out of your pouch and therefore you will be hungry quicker. It is important not to drink thiry minutes before or after each meal. I had my surgery on December 18th. I am learning too. The only thing that I can think of the BPing means is maybe burping. I have never been a burper, but now that I have the lapband I burp a lot. At the support group meeting I attended last night someone said you burp b/c air comes up from you larger stomach through the band and into your pouch causing you to burp. It makes sense to me. I hope this helps.